Combined reinforcing-plate and key-lug for brake-shoes.



H. M'cDONOUGH.

COMBINED REINFORCING PLATE AND KEY LUG FOR BRAKE SHOES.

APPLICATION FILED APILZS. I916.

Patented May 22, 1917.

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WILLIAM H. MGDONOUGH, OF NEW YORK, N. Y ASSIGNOR, BY IIIESNE ASSIGNMENT'S,

TO THE AMERICAN BRAKE SHOE AND FOUNDRY COMPANY, OF.WIL1VIINGTON, DELA- WARE, A CORPORATION DELAWARE.

COMBINED REINFORCING-PLATE AND KEY-LUG Foru BRAKE-SHOES.

Specification of Letterslatent.

1,227,282. Patented May 22 1917.

Application filed April 25, 1916. Serial No. 93,362.

the point Where the greatest strains occur,

To all whom it may concern? and this is most undeslrable 1n devlces of Be'it known that I, WILLiAM H. Mo-.

and State of New York, have made a certain new and useful Invention in Combined Reinforcing-Plates and Key-Lugs for Brake- Shoes, of which the following is a specification.

The invention relates to brake shoes and particularly tothe reinforcing back plate and key lug employed in connection with such devices.

The object of the invention is to provide an integral key lug and back plate for brake shoes, and means to reinforce the structure at the point where the key lug is formed.

Other objects of the invention will appear more fully hereinafter.

The invention consists substantially in the construction, combination, location and relative arrangement of parts, all as will be more fully hereinafter set forth, as shown in the accompanying drawing and finally pointed out in the appended claims.

Referring to the drawing:-

Figure 1 is a view in perspective showing a combined brake shoe back plate and key lug embodying my invention in one form thereof.

2 is a view in longitudinal section, on the line :2, 2,1 ig. 1, looking in the direction of the arrows.

Fig. 3 is a view similar to Fig. 2, showing a modified form of my invention.

It is a common practice in the manufacture of brake shoes to apply a reinforcing back plate of ductile metal, such as sheet steel, to the cast metal shoe body, and to form a key lug for attaching the shoe to the brake head by transversely bending the back plate centrally into an integral loop with openings through the transversely extending walls of the loop for the passage of the securing key. Such structure, however, interrupts the continuity of the'backplate, leaving the space across the throat of'the integral key lug unprotected and without reinforcement. As the greatest strains in use, are imposed on the device at the key lug, it will be seen that in the construction referred to, and without reinforcement of the back plate across thethroat of the key lug, the weakest part of the structure occursat this nature.

It is among the "special purposes of my present'inventionto provide a structure of back'plate formed with an integral key lug, and wherein reinforcement is provided across'the throat of the key lug, and in a most simple and efiicient manner, thereby avoiding the objections noted and securing added strength at the point where the greatest strains occur.

V In Figs. 1 and 2 I have vshownone form of embodiment of my invention wherein 5 designates the metal back plate which, if desired, may be provided with the usual openings 6, therethrough to permit the metal of the cast shoe (not shown) to flush therethrough, in casting the shoe, to afford means for attaching the plate and shoe body together. Centrally of its length the plate is transversely folded or bent to form the integral key lug 7 the transverse walls 8, 9,

of which having alined openings 10, formed through the metal thereof for the passage of the brake head locking key. In this arrangement of key slots or openin s it will be seen that the entire bearing o the key is taken by the metal of the key lug itself,

tends across the throat of the key lug and ties together the parts of the plate lying on opposite sides of the key lug. By pressing the off-sets or seats 11 in theplate at opposite sides of the key lug and positioning the reinforcingtie plate therein the inner surface of said tie plate is brought into flush relation with respect to the inner surface of the back plate. This reinforcing tie plate may have one or more openings 13, therethrough for the metal of the cast shoe body to flush through in casting the same to afford means for attaching the tie plate to the shoe body.

Inthe form shown in Fig. 3, the reinforcing tie plate 14: is centrally pressed outwardly to form an extension 15 which extends outwardly and partially into the throat of the key lug 7, to affordan additional reinforcement of the key lug andto aid in taking the strains of usage. One or more openings 16, may be formed through the outwardly pressed extension 15 of the tie plate for the same purpose as the open ings 6, 13, above referred to. g

It will be understood that the reinforcing tie plate may be secured to the back plate if desired, and in any desired manner.

' Having now set forth the objects and na-' ture of my invention and various forms of embodiment thereof, what I claim as new seats on its inner surface, and a tieplate received in said seats and spanning the throat of said lug. 4 V

2. A back plate for brake shoes bentup transversely to form an integral key lug, and areinforcing plate extending across the throat of said lug, said tie plate lying flush with the inner surface of said plate.

3. A. reinforcing rack for' brake shoes consisting ofja plate with an outwardly formed integral key lug, the 'inner'surface of said plate adjacent the sides of said lug provided with seats, a tie plate received in said seats and spanning the throat of said lug.

In testimony whereof I have hereunto set my hand on this 20th day of April A. D., 1916.

WILLIAM H McDONOUGH.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents.

Washington, D. C. 

